Thanks Adam, that icon is the one I found by accident.
As for the sequencer, I have watched a couple of videos on it but forgot all about it, got distracted by the imaging issue. Once I actually start using it all hopefully it will start coming together.
I'm used to steep learning curves but this is something else! When I took up Black Powder shooting there was a lot to learn, but unfortunately there is also an element of "the dark arts" involved as results aren't always predictable - but at least there are no computers involved!!

In this case there will always be a valid reason why something doesn't work, the problem is finding it.
Thanks again mate.
Edit: couple of hours later. I think I've exhausted the possibilties, the only real adjustments to the camera settings are exposure time and gain. It doesn't matter what combination of these settings I try the best I can get is a grainy, dark, slightly blurry image. When I use Sharpcap, however, it shows a very nice image right from the outset, so there's nothing wrong with the camera. The only thing I can think of is there is an incompatibility between NINA and this particular camera model.